SELENIUM What is SELENIUM? • Selenium is a free (open source) automated testing suite for web applications across different browsers and platforms. • Selenium is not just a single tool but a suite of software, each catering to different testing needs of an organization. It has four components. • • • • Selenium Integrated Development Environment (IDE) Selenium Remote Control (RC) WebDriver Selenium Grid SELENIUM IDE • Selenium Integrated Development Environment (IDE) is the simplest framework in the Selenium suite and is the easiest one to learn. It is a Firefox plugin that you can install as easily as you can with other plugins. However, because of its simplicity, Selenium IDE should only be used as a prototyping tool. • If you want to create more advanced test cases, you will need to use either Selenium RC or WebDriver. SELENIUM REMOTE CONTROL (RC) • Selenium RC was the flagship testing framework of the whole Selenium project for a long time. This is the first automated web testing tool that allowed users to use a programming language they prefer. As of, RC can support the following programming languages: • Java • C# • PHP • Python • Perl • Ruby SELENIUM WEB DRIVER • The WebDriver proves itself to be better than both Selenium IDE and Selenium RC in many aspects. It implements a more modern and stable approach in automating the browser’s actions. WebDriver, unlike Selenium RC, does not rely on JavaScript for automation. It controls the browser by directly communicating to it. • The supported languages are the same as those in Selenium RC. • Java • C# • PHP • Python • Perl • Ruby SELENIUM GRID • Selenium Grid is a tool used together with Selenium RC to run parallel tests across different machines and different browsers all at the same time. Parallel execution means running multiple tests at once. • Features: • Enables simultaneous running of tests in multiple browsers and environments. • Saves time enormously. • Utilizes the hub-and-nodes concept. The hub acts as a central source of Selenium commands to each node connected to it. Selenium IDE Selenium RC WebDriver Internet Explorer versions 6 to 9, both 32 and 64-bit Firefox 3.0, 3.5, 3.6, 4.0, 5.0, 6, 7 and above (current version is 16.0.1) Browser Support Mozilla Firefox Mozilla Firefox Internet Explorer Google Chrome Safari Opera Konqueror Others Google Chrome 12.0.712.0 and above (current version is 22.0.1229.94 m) Opera 11.5 and above (current version is 12.02) Android – 2.3 and above for phones and tablets (devices & emulators) iOS 3+ for phones (devices & emulators) and 3.2+ for tablets (devices & emulators) HtmlUnit 2.9 and above (current version is 2.10) Operating System Windows Mac OS X Linux Windows Mac OS X Linux Solaris All operating systems where the browsers above can run. Tool Why Choose ? Selenium IDE •To learn about concepts on automated testing and Selenium, including: •Selenese commands such as type, open, clickAndWait, assert, verify, etc. •Locators such as id, name, xpath, css selector, etc. •Executing customized JavaScript code using runScript •Exporting test cases in various formats. •To create tests with little or no prior knowledge in programming. •To create simple test cases and test suites that you can export later to RC or WebDriver. •To test a web application against Firefox only. Selenium RC •To design a test using a more expressive language than Selenese •To run your test against different browsers (except HtmlUnit) on different operating systems. •To deploy your tests across multiple environments using Selenium Grid. •To test your application against a new browser that supports JavaScript. •To test web applications with complex AJAX-based scenarios. WebDriver Selenium Grid •To use a certain programming language in designing your test case. •To test applications that are rich in AJAX-based functionalities. •To execute tests on the HtmlUnit browser. •To create customized test results. •To run your Selenium RC scripts in multiple browsers and operating systems simultaneously. •To run a huge test suite, that need to complete in soonest time possible. Create a Script by Recording Step 1 •Launch Firefox and Selenium IDE. •Type the value for our Base URL: http://newtours.demoaut.com/. •Toggle the Record button on (if it is not yet toggled on by default). Step 2 • In Firefox, navigate to http://newtours.demoaut.com/. Firefox should take you to the page similar to the one shown below. Step 3 • Right-click on any blank space within the page, like on the Mercury Tours logo on the upper left corner. This will bring up the Selenium IDE context menu. Note: Do not click on any hyperlinked objects or images • Select the “Show Available Commands” option. • Then, select “assertTitle exact:Welcome: Mercury Tours”. This is a command that makes sure that the page title is correct. Step 3 Step 4 •In the “User Name” text box of Mercury Tours, type an invalid username, “invalidUN”. •In the “Password” text box, type an invalid password, “invalidPW”. Step 5 • Click on the “Sign-In” button. Firefox should take you to this page. Step 6 • Toggle the record button off to stop recording. Your script should now look like the one shown below. Step 7 • Now that we are done with our test script, we shall save it in a test case. In the File menu, select “Save Test Case”. Alternatively, you can simply press Ctrl+S. Step 8 • Choose your desired location, and then name the test case as “Invalid_login”. • Click the “Save” button. Step 9 • Notice that the file was saved as HTML. Step 10 • Go back to Selenium IDE and click the Playback button to execute the whole script. Selenium IDE should be able to replicate everything flawlessly. Selenium Commands • Introduction to Selenium Commands – Selenese • Selenese commands can have up to a maximum of two parameters: target and value. • Parameters are not required all the time. It depends on how many the command will need. 3 types of commands Actions Accessors Assertions These are commands that directly interact with page elements. Example: the “click” command is an action because you directly interact with the element you are clicking at. The “type” command is also an action because you are putting values into a text box, and the text box shows them to you in return. There is a two-way interaction between you and the text box. They are commands that allow you to store values to a variable. Example: the “storeTitle” command is an accessor because it only “reads” the page title and saves it in a variable. It does not interact with any element on the page. They are commands that verify if a certain condition is met. 3 Types of Assertions •Assert. When an “assert” command fails, the test is stopped immediately. •Verify. When a “verify” command fails, Selenium IDE logs this failure and continues with the test execution. •WaitFor. Before proceeding to the next command, “waitFor” commands will first wait for a certain condition to become true. • If the condition becomes true within the waiting period, the step passes. • If the condition does not become true, the step fails. Failure is logged, and test execution proceeds to the next command. • By default, timeout value is set to 30 seconds. You can change this in the Selenium IDE Options dialog under the General tab. ASSERT v/s VERIFY ASSERT v/s VERIFY Common Commands Command Number of Parameters open 0-2 click/clickAndWait 1 Clicks on a specified element. type/typeKeys 2 Types a sequence of characters. verifyTitle/assertTitle 1 Compares the actual page title with an expected value. verifyTextPresent 1 Checks if a certain text is found within the page. verifyElementPresent 1 Checks the presence of a certain element. verifyTable 2 Compares the contents of a table with expected values. waitForPageToLoad 1 Pauses execution until the page is loaded completely. waitForElementPresent 1 Pauses execution until the specified element becomes present. Description Opens a page using a URL. Create a Script Manually with Firebug. Step 1 •Open Firefox and Selenium IDE. •Type the base URL (http://newtours.demoaut.com/). •The record button should be OFF. Step 2 • Click on the topmost blank line in the Editor. • Type “open” in the Command text box and press Enter. Step 3: • Navigate Firefox to our base URL and activate Firebug • In the Selenium IDE Editor pane, select the second line (the line below the “open” command) and create the second command by typing “assertTitle” on the Command box. • Feel free to use the autocomplete feature. Step 4 • In Firebug, expand the <head> tag to display the <title> tag. • Click on the value of the <title> tag (which is “Welcome: Mercury Tours”) and paste it onto the Target field in the Editor. Step 5: • To create the third command, click on the third blank line in the Editor and key-in “type” on the Command text box. • In Firebug, click on the “Inspect” button. • Click on the User Name text box. Notice that Firebug automatically shows you the HTML code for that element. Step 6 • Notice that the User Name text box does not have an ID, but it has a NAME attribute. We shall, therefore, use its NAME as the locator. Copy the NAME value and paste it onto the Target field in Selenium IDE. Step 6 • Still in the Target text box, prefix “userName” with “name=”, indicating that Selenium IDE should target an element whose NAME attribute is “userName.” Step 6: • Type “invalidUN” in the Value text box of Selenium IDE. Your test script should now look like the image below. We are done with the third command. Note: Instead of invalidUN , you may enter any other text string. But Selenium IDE is case sensitive and you type values/attributes exactly like in application. Step 7 • To create the fourth command, key-in “type” on the Command text box. • Again, use Firebug’s “Inspect” button to get the locator for the “Password” text box. Step 7 • Paste the NAME attribute (“password”) onto the Target field and prefix it with “name=” • Type “invalidPW” in the Value field in Selenium IDE. Your test script should now look like the image below. Step 8 • For the fifth command, type “clickAndWait” on the Command text box in Selenium IDE. • Use Firebug’s “Inspect” button to get the locator for the “Sign In” button. Step 8 Paste the value of the NAME attribute (“login”) onto the Target text box and prefix it with “name=”. Your test script should now look like the image below. Step 9 • Save the test case in the same way as we did in the previous section. Using Find Button • The Find button in Selenium IDE is used to verify if what we had put in the Target text box is indeed the correct UI element. • Let us use the Invalid_login test case that we created in the previous sections. Click on any command with a Target entry, say, the third command. • Click on the Find button. Notice that the User Name text box within the Mercury Tours page becomes highlighted for a second. This indicates that Selenium IDE was able to detect and access the expected element correctly. If the Find button highlighted a different element or no element at all, then there must be something wrong with your script. Execute Command • This allows you to execute any single command without running the whole test case. Just click on the line you wish to execute and then either click on “Actions > Execute this command” from the menu bar or simply press “X” on your keyboard. • Step 1. Make sure that your browser is on the Mercury Tours homepage. Click on the command you wish to execute. In this example, click on the “type | userName | invalidUN” line. Execute Command Step 2. Press “X” on your keyboard. Step 3. Observe that the text box for username becomes populated with the text “invalidUN” Executing commands this way is highly dependent on the page that Firefox is currently displaying. This means that if you try the example above with the Google homepage displayed instead of Mercury Tours’, then your step will fail because there is no text box with a “userName” attribute within Google’s homepage. SELENIUM WEBDRIVER • WebDriver is a web automation framework that allows you to execute your tests against different browsers, not just Firefox (unlike Selenium IDE). SELENIUM WEB DRIVER • WebDriver also enables you to use a programming language in creating your test scripts(not possible in Selenium IDE). • You can now use conditional operations like if-then-else or switch-case • You can also perform looping like do-while. • Following programming languages are supported by WebDriver • • • • • • Java .Net PHP Python Perl Ruby • You do not have to know all of them. You just need to be knowledgeable in one. WebDriver v/s Selenium RC • Before advent of WebDriver in 2006, there was another, automation tool called Selenium Remote Control. Both WebDriver and Selenium RC have following features: • They both allow you to use a programming language in designing your test scripts. • They both allow you to run your tests against different browsers. ARCHITECTURE • WebDriver’s architecture is simpler than Selenium RC’s. • It controls the browser from the OS level • All you need are your programming language’s IDE (which contains your Selenium commands) and a browser. Selenium RC’s architecture is way more complicated. • You first need to launch a separate application called Selenium Remote Control (RC) Server before you can start testing • The Selenium RC Server acts as a “middleman” between your Selenium commands and your browser • When you begin testing, Selenium RC Server “injects” a Javascript program called Selenium Core into the browser. • Once injected, Selenium Core will start receiving instructions relayed by the RC Server from your test program. • When the instructions are received, Selenium Core will execute them as Javascript commands. • The browser will obey the instructions of Selenium Core, and will relay its response to the RC Server. • The RC Server will receive the response of the browser and then display the results to you. • RC Server will fetch the next instruction from your test script to repeat the whole cycle. Speed • WebDriver is faster than Selenium RC since it speaks directly to the browser uses the browser’s own engine to control it. • Selenium RC is slower sinceit uses a Javascript program called Selenium Core.This Selenium Core is the one that directly controls the browser, not you. Real-life Interaction • WebDriver interacts with page elements in a more realistic way. For example, if you have a disabled text box on a page you were testing, WebDriver really cannot enter any value in it just as how a real person cannot. • Selenium Core, just like other Javascript codes, can access disabled elements .In the past, Selenium testers complain that Selenium Core was able to enter values to a disabled text box in their tests. Differences in API Selenium RC’s API is more matured but contains redundancies and often confusing commands. For example, most of the time, testers are confused whether to use type or typeKeys; or whether to use click, mouseDown, or mouseDownAt. Worse, different browsers interpret each of these commands in different ways too! WebDriver’s API is simpler than Selenium RC’s. It does not contain redundant and confusing commands. Browser Support WebDriver can support the headless HtmlUnit browser. HtmlUnit is termed as “headless” because it is an invisible browser – it is GUI-less. It is a very fast browser because no time is spent in waiting for page elements to load. This accelerates your test execution cycles. Since it is invisible to the user, it can only be controlled through automated means. Selenium RC cannot support the headless HtmlUnit browser. It needs a real, visible browser to operate on. Limitations of WebDriver • WebDriver Cannot Readily Support New Browsers • WebDriver operates on the OS level. Also remember that different browsers communicate with the OS in different ways. If a new browser comes out, it may have a different process of communicating with the OS as compared to other browsers. • However, it is up to the WebDriver’s team of developers to decide if they should support the new browser or not. Selenium RC Has Built-In Test Result Generator WebDriver v/s Selenium RC • Selenium RC automatically generates an HTML file of test results. The format of the report was pre-set by RC itself. Take a look at an example of this report below. • WebDriver has no built-in command that automatically generates a Test Results File. You would have to rely on your IDE’s output window, or design the report yourself using the capabilities of your programming language and store it as text, html, etc. Summary • WebDriver is a tool for testing web applications across different browsers using different programming languages. • You are now able to make powerful tests because WebDriver allows you to use a programming language of your choice in designing your tests. • WebDriver is faster than Selenium RC because of its simpler architecture. • WebDriver directly talks to the browser while Selenium RC needs the help of the RC Server in order to do so. • WebDriver’s APIismore concise than Selenium RC’s. • WebDriver can support HtmlUnit while Selenium RC cannot. • The only drawbacks of WebDriver are: • It cannot readily support new browsers, but Selenium RC can. • It does not have a built-in command for automatic generation of test results. Installing Selenium WebDriver • Step 1 – Install Java on your computer • Step 2 – Install Eclipse IDE • Step 3 – Download the Selenium Java Client Driver • Step 4 – Configure Eclipse IDE with WebDriver Step 4: 1. Launch the “eclipse.exe” file inside the “eclipse” folder that we extracted in step 2. If you followed step 2 correctly, the executable should be located on C:\eclipse\eclipse.exe. 2. When asked to select for a workspace, just accept the default location. 3. Create a new project through File > New > Java Project. Name the project as “myproject”. 4. Right-click on the newly created project and select New > Package, and name that package as “mypackage”. 5. Create a new Java class under mypackage by right-clicking on it and then selecting New > Class, and then name it as “myclass”. Step 6: Step 6 1. Right-click on myproject and select Properties. 2. On the Properties dialog, click on “Java Build Path”. 3. Click on the Libraries tab, and then click “Add External JARs..” 4. Navigate to C:\selenium-2.25.0\ (or any other location where you saved the extracted contents of “selenium-2.25.0.zip” in step 3). 5. Add all the JAR files inside and outside the “libs” folder. 6. Finally, click OK and we are done importing Selenium libraries into our project. WEBDRIVER SCRIPT Using the Java class “myclass” that we created in the previous tutorial, let us try to create a WebDriver script that would: • fetch Mercury Tours’ homepage • verify its title • print out the result of the comparison • close it before ending the entire program. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. package mypackage; import org.openqa.selenium.WebDriver; import org.openqa.selenium.firefox.FirefoxDriver; public class myclass { public static void main(String[] args) { // declaration and instantiation of objects/variables WebDriver driver = new FirefoxDriver(); String baseUrl = "http://newtours.demoaut.com"; String expectedTitle = "Welcome: Mercury Tours"; String actualTitle = ""; // launch Firefox and direct it to the Base URL driver.get(baseUrl); // get the actual value of the title actualTitle = driver.getTitle(); /* * compare the actual title of the page witht the expected one and print * the result as "Passed" or "Failed" */ if (actualTitle.contentEquals(expectedTitle)){ System.out.println("Test Passed!"); } else { System.out.println("Test Failed"); } //close Firefox driver.close(); // exit the program explicitly System.exit(0); } } Code Explanation • Importing Packages • To get started, you need to import following two packages: • org.openqa.selenium.*- contains the WebDriver class needed to instantiate a new browser loaded with a specific driver • org.openqa.selenium.firefox.FirefoxDriver – contains the FirefoxDriver class needed to instantiate a Firefox-specific driver onto the browser instantiated by the WebDriver class • If your test needs more complicated actions such as accessing another class, taking browser screenshots, or manipulating external files, definitely you will need to import more packages. Instantiating objects and variables Normally, this is how a driver object is instantiated. A FirefoxDriver class with no parameters means that the default Firefox profile will be launched by our Java program. The default Firefox profile is similar to launching Firefox in safe mode (no extensions are loaded). For convenience, we saved the Base URL and the expected title as variables Launching a Browser Session • WebDriver’s get() method is used to launch a new browser session and directs it to the URL that you specify as its parameter. Get the Actual Page Title • The WebDriver class has the getTitle() method that is always used to obtain the page title of the currently loaded page. Compare the Expected and Actual Values This portion of the code simply uses a basic Java if-else structure to compare the actual title with the expected one. Terminating a Browser Session • The “close()” method is used to close the browser window. Terminating the Entire Program • If you use this command without closing all browser windows first, your whole Java program will end, while leaving browser window open. Running the Test • There are two ways to execute code in Eclipse IDE. • On Eclipse’s menu bar, click Run > Run. • Press Ctrl+F11 to run the entire code. If you did everything correctly, Eclipse would output “Test Passed!” Locating GUI Elements • Locating elements in WebDriver is done by using the “findElement(By.locator())” method. The “locator” part of the code is same as any of the locators previously discussed in the Selenium IDE chapters of these tutoriasl.Infact , it is recommeded you locate GUI elements using IDE and once successfully identified export the code to webdriver. • Here is a sample code that locates an element by its id. Facebook is used as the Base URL. Locating GUI Elements 1. package mypackage; 2. import org.openqa.selenium.By; 3. import org.openqa.selenium.WebDriver; 4. import org.openqa.selenium.firefox.FirefoxDriver; 5. public class myclass { 6. public static void main(String[] args) { 7. WebDriver driver = new FirefoxDriver(); 8. String baseUrl = "http://www.facebook.com"; 9. String tagName = ""; 10. driver.get(baseUrl); 11. tagName = driver.findElement(By.id("email")).getTagName(); 12. System.out.println(tagName); 13. driver.close(); 14. System.exit(0); 15. } 16.} • We used the getTagName() method to extract the tag name of that particular element whose id is “email”. When run, this code should be able to correctly identify the tag name “input” and will print it out on Eclipse’s Console window. Some Locating Elements Variation Description By.className finds elements based on the value of the “class” attribute By.cssSelector finds elements based on the driver’s underlying CSS Selector engine By.id locates elements by the value of their “id” attribute Sample findElement(By.className(“ someClassName”)) findElement(By.cssSelector(“ input#email”)) findElement(By.id(“someId”) ) finds a link element by the exact text it displays findElement(By.linkText(“RE GISTRATION”)) locates elements by the value of the “name” attribute findElement(By.name(“some Name”)) By.partialLinkText locates elements that contain the given link text findElement(By.partialLinkTe xt(“REG”)) By.tagName locates elements by their tag name By.linkText By.name By.xpath locates elements via XPath findElement(By.tagName(“di v”)) findElement(By.xpath(“//ht ml/body/div/table/tbody/tr/ td[2]/table/tbody/tr[4]/td/t Note on Using findElement(By.cssSelector()) • By.cssSelector() does not support the “contains” feature. Consider the Selenium IDE code below - • In Selenium IDE, the entire test passed. However in the WebDriver script below, the same test generated an error because WebDriver does not support the “contains” keyword when used in the By.cssSelector() method. Common Commands Instantiating Web Elements • Instead of using the long “driver.findElement(By.locator())” syntax every time you will access a particular element, we can instantiate a WebElement object for it. The WebElement class is contained in the “org.openqa.selenium.*” package. Common Commands Clicking on an Element • Clicking is perhaps the most common way of interacting with web elements. The click() method is used to simulate the clicking of any element. The following example shows how click() was used to click on Mercury Tours’ “Sign-In” button. Following things must be noted when using the click() method. •It does not take any parameter/argument. •The method automatically waits for a new page to load if applicable. •The element to be clicked-on, must be visible (height and width must not be equal to zero). Get Commands • Get commands fetch various important information about the page/element. Here are some important “get” commands you must be familiar with. get() getTitle() getPageSource() getCurrentUrl() getText() •It automatically opens a new browser window and fetches the page that you specify inside its parentheses. •It is the counterpart of Selenium IDE’s “open” command. •The parameter must be a String object. •Needs no parameters •Fetches the title of the current page •Leading and trailing white spaces are trimmed •Returns a null string if the page has no title •Needs no parameters •Returns the source code of the page as a String value •Needs no parameters •Fetches the string representing the current URL that the browser is looking at •Fetches the inner text of the element that you specify Navigate commands navigate().to() navigate().refresh() navigate().back() navigate().forward() •It automatically opens a new browser window and fetches the page that you specify inside its parentheses. •It does exactly the same thing as the get() method. •Needs no parameters. •It refreshes the current page. •Needs no parameters •Takes you back by one page on the browser’s history. •Needs no parameters •Takes you forward by one page on the browser’s history. Closing and Quitting Browser Windows close() •Needs no parameters •It closes only the browser window that WebDriver is currently controlling. quit() •Needs no parameters •It closes all windows that WebDriver has opened. 1. package mypackage; 2. import org.openqa.selenium.WebDriver; 3. import org.openqa.selenium.firefox.FirefoxDriver; 4. public class myclass { 5. public static void main(String[] args) { 6. WebDriver driver = new FirefoxDriver(); 7. driver.get("http://www.popuptest.com/popuptest2.html"); 8. driver.quit(); // using QUIT all windows will close 9. } 10. } Switching Between Frames • To access GUI elements in a Frame, we should first direct WebDriver to focus on the frame or pop-up window first before we can access elements within them. Let us take, for example, the web page http://selenium.googlecode.com/svn/trunk/docs/api/java/index .html • This page has 3 frames whose “name” attributes are indicated above. We wish to access the “Deprecated” link encircled above in yellow. In order to do that, we must first instruct WebDriver to switch to the “classFrame” frame using the “switchTo().frame()” method. We will use the name attribute of the frame as the parameter for the “frame()” part. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. package mypackage; import org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.firefox.FirefoxDriver; public class myclass { public static void main(String[] args) { WebDriver driver = new FirefoxDriver(); driver.get("http://selenium.googlecode.com/svn/trunk/docs/api/java/inde x.html"); driver.switchTo().frame("classFrame"); driver.findElement(By.linkText("Deprecated")).click(); driver.quit(); } } After executing this code, you will see that the “classFrame” frame is taken to the “Deprecated API” page, meaning that our code was successfully able to access the “Deprecated” link. Switching Between Pop-up Windows • WebDriver allows pop-up windows like alerts to be displayed, unlike in Selenium IDE. To access the elements within the alert (such as the message it contains), we must use the “switchTo().alert()” method. In the code below, we will use this method to access the alert box and then retrieve its message using the “getText()” method, and then automatically close the alert box using the“switchTo().alert().accept()” method. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. package mypackage; import org.openqa.selenium.By; import org.openqa.selenium.WebDriver; import org.openqa.selenium.firefox.FirefoxDriver; public class myclass { public static void main(String[] args) { WebDriver driver = new FirefoxDriver(); String alertMessage = ""; driver.get("http://jsbin.com/usidix/1"); driver.findElement(By.cssSelector("input[value=\"Go!\"]")).click(); alertMessage = driver.switchTo().alert().getText(); driver.switchTo().alert().accept(); System.out.println(alertMessage); driver.quit(); } } On the Eclipse console, notice that the printed alert message is:
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